GoDaddy and .Mac (MobileMe) Problem.

First off, I am a noob when it comes to networking, servers, and web building. Whenever you go to my website (www.blupod.com) it works fine. But when you go to BluPod.com without the www it takes you to GoDaddy. I was told I can fix it by doing something in the "A" field of DNS settings but what do I put there?